<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        // 闭包产生随机数
        // 思路： 把生成的随机数缓存下来 一致调用输出
        function fn() {
            var num = Math.floor(Math.random() * 10 + 1);
            return function () {
                return num;
            }
        }
        var result = fn();
        console.log(result());
        console.log(result());
        console.log(result());
    </script>
</body>
</html>